Burnt out Electric Fence Tape

[Terminal Crazy]

Hi guys,
Anyone got any answers to an odd phenomena i've seen with an electric fence
tape.
The tape in 1/2 inch wide insulated with about 5 or six stainless strands
woven through it.
I have a 30ft section that has burn marks across the witdth of the tape at
about six inch intervals along the whole length. I know some of the wires
are broken at some points and you can see sparks jumping the breaks but
they vary where they jump.

Can anyone explain why the burn marks should be so regular?

Thanks

--
Terminal_Crazy

Mitch - 1995 Z28 LT1 M6 terminal_crazy@sand-hill.freeserve.co.uk
Lancashire England http://www.sand-hill.freeserve.co.uk/terminal_crazy/

 

[Phil Hobbs]

On 05/19/2012 08:41 AM, Terminal Crazy wrote:

Hi guys,
Anyone got any answers to an odd phenomena i've seen with an electric fence
tape.
The tape in 1/2 inch wide insulated with about 5 or six stainless strands
woven through it.
I have a 30ft section that has burn marks across the witdth of the tape at
about six inch intervals along the whole length. I know some of the wires
are broken at some points and you can see sparks jumping the breaks but
they vary where they jump.

Can anyone explain why the burn marks should be so regular?

Thanks

Maybe it was sold folded up instead of coiled?

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net

 

[Terminal Crazy]

In article <faidndfg5PnxMCrSnZ2dnUVZ_uednZ2d@supernews.com>,
Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

Maybe it was sold folded up instead of coiled?

Nope. Definately came off a roll.

I can understand a hot spot/high resistance burning out but not repeatedly
along the length at regular intervals.

--
Terminal_Crazy

Mitch - 1995 Z28 LT1 M6 terminal_crazy@sand-hill.freeserve.co.uk
Lancashire England http://www.sand-hill.freeserve.co.uk/terminal_crazy/

 

[Ian Field]

"Terminal Crazy" <Terminal_Crazy@sand-hill.freeserve.co.uk> wrote in message
news:529282335aTerminal_Crazy@sand-hill.freeserve.co.uk...

In article <faidndfg5PnxMCrSnZ2dnUVZ_uednZ2d@supernews.com>,
Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

Maybe it was sold folded up instead of coiled?

Nope. Definately came off a roll.

I can understand a hot spot/high resistance burning out but not repeatedly
along the length at regular intervals.

I'll probably get howls of derision for suggesting this - but how steep is
the risetime on the HV pulses?

Maybe constructive interference on reflected waves?!

 

[Terminal Crazy]

In article <j_Utr.96719$2R.67049@fx19.am4>, Ian Field
<gangprobing.alien@ntlworld.com> wrote:

I'll probably get howls of derision for suggesting this - but how steep
is the risetime on the HV pulses?
It pulses about every 3-4 seconds, very similar to a car HT Plug lead about

IIRC 4-5000 volts at the unit.

Maybe constructive interference on reflected waves?!

--
Terminal_Crazy

Mitch - 1995 Z28 LT1 M6 terminal_crazy@sand-hill.freeserve.co.uk
Lancashire England http://www.sand-hill.freeserve.co.uk/terminal_crazy/

 

[Ian Field]

"Terminal Crazy" <Terminal_Crazy@sand-hill.freeserve.co.uk> wrote in message
news:5292f096e5Terminal_Crazy@sand-hill.freeserve.co.uk...

In article <j_Utr.96719$2R.67049@fx19.am4>, Ian Field
gangprobing.alien@ntlworld.com> wrote:

I'll probably get howls of derision for suggesting this - but how steep
is the risetime on the HV pulses?
It pulses about every 3-4 seconds, very similar to a car HT Plug lead
about
IIRC 4-5000 volts at the unit.

I'm actually thinking a problem with the weaving machine during manufacture.

Maybe the strands of SS wire are a set length woven into the fabric and if
done properly should have several points of contact with other strands to
guarantee continuity - a weaving malfunction in that case would result in
discontinuities at regular distances.

Have you tried checking continuity on a new length?